G40.42 — Cyclin-Dependent Kinase-Like 5 Deficiency Disorder
G40.42 is a billable, specific ICD-10-CM code for cyclin-dependent kinase-like 5 deficiency disorder. It is valid for submission on a claim.
Risk adjustment
G40.42 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:
- HCC 201 Seizure Disorders and Convulsions0.245 RAF
Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.
Medicare coverage
G40.42 is named in 10 Medicare coverage policies — 10 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56551Billing and Coding: Visual Fields Testing
- A56612Billing and Coding: CT of the Head
- A56619Billing and Coding: Nerve Conduction Studies and Electromyography
- A56799Billing and Coding: Visual Fields Testing
How G40.42 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to G40.42.
- CDKL5(Cyclin-Dependent Kinase-Like 5 Deficiency Disorder)
- Disorder›Cyclin-Dependent Kinase-Like 5 Deficiency(CDKL5)
Related codes at this level
Codes that share G40.4. If G40.42 is not quite right, the correct code is usually one of these.
Questions about G40.42
- Is G40.42 a billable ICD-10-CM code?
- Yes. G40.42 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does G40.42 sit in the tabular list?
- Diseases of the nervous system (G00-G99), in the block Episodic and paroxysmal disorders (G40-G47).